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Re: Re: Discovery Project: Which Mission Next?
on 9/4/00 11:55 PM, Tony Langdon at tlangdon@atctraining.com.au wrote:
>> What I think we need is something like about a 1 second frame
>> rate. This
>> would only take 12 dB more than FM and about 250 KHz instead
>> of the 6 MHz
>> for FSTV.. But rather than inventing another wheel, I suspect the mor
>> universal approach will be just to have a high data rate digital
>> transponsder, and then JPIG images can be exchanged just as
>> easliy... ANd
>> with the possible compression, this will be far more effecient thatn
>> either FSTV or FAST-FM SSTV....
>>
>> In any case, what would be a good target? 1 Image a second?
>
> Well, with digital technology, it has already been proven that a useable (~
> 1fps) video channel can be obtained on a data stream < 30kbps. Many people
> do it everyday on the Internet! So, it's not unreasonable to expect a
> moderate bandwidth video link vis satellite. At 30kbps, this is within
> current bandwidths and modem technology.
I believe that P3D has some really fast digital capabilities. With 64K, you
certainly can get a decent compressed frame rate. If we were ever able to
get up to a 300 K rate, you could get a full frame video stream.
DEFINITELY something to think about, but Bob is also right - NOT for a LEO!
73,
Jon
NA9D
-------------------------------------
Jon Ogden
NA9D (ex: KE9NA)
Member: ARRL, AMSAT, DXCC, NRA
http://www.qsl.net/ke9na
"A life lived in fear is a life half lived."
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